<template>
  <div class="upload-file">
    <el-upload
      multiple
      :action="uploadFileUrl"
      name="file"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      class="upload-file-uploader"
      ref="fileUpload"
    >
      <!-- 上传按钮 -->
      <!-- <el-button size="mini" type="primary">选取文件</el-button> -->
      <div class="file-upload">
        <i class="el-icon-plus"></i>
      </div>
      <!-- 上传提示 -->
      <div class="el-upload__tip" slot="tip" v-if="showTip">
        请上传
        <!-- <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template> -->
        <template v-if="fileType">
          格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
        的文件
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group
      class="upload-file-list el-upload-list el-upload-list--text"
      name="el-fade-in-linear"
      tag="ul"
    >
      <li
        class="el-upload-list__item ele-upload-list__item-content"
        v-for="(file, index) in fileList"
        :key="index + '_'"
      >
        <el-link
          :href="`${baseUrl}${file.url}`"
          :underline="false"
          target="_blank"
        >
          <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
        </el-link>
        <div class="ele-upload-list__item-content-action">
          <el-link :underline="false" @click="handleDelete(index)" type="danger"
            >删除</el-link
          >
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";
import * as XLSX from "xlsx";

export default {
  name: "FileUpload",
  props: {
    // 值
    value: [String, Object, Array],
    // 数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    // fileSize: {
    //   type: Number,
    //   default: 5,
    // },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["xlsx", ".xls"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
    projectType: {
      type: String,
      require: true,
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadFileUrl: process.env.VUE_APP_BASE_API + "/file/upload", // 上传文件服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          let temp = 1;
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(",");
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            if (typeof item === "string") {
              if (item.split(this.baseUrl) > -1) {
                item = { name: this.getFileName(item), url: item };
              } else {
                item = {
                  name: this.getFileName(item),
                  url: this.baseUrl + item,
                };
              }
            }
            item.uid = item.uid || new Date().getTime() + temp++;
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && this.fileType;
    },
  },
  methods: {
    // 上传前校检格式和大小
    async handleBeforeUpload(file) {
      const _this = this;
      // 校检文件类型
      if (this.fileType) {
        const fileName = file.name.split(".");
        const fileExt = fileName[fileName.length - 1];
        const isTypeOk = this.fileType.indexOf(fileExt) >= 0;
        if (!isTypeOk) {
          this.$modal.msgError(
            `文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`
          );
          return false;
        }
      }
      // 校验表头
      await this.validExcelHeader(file);

      // 校检文件大小
      // if (this.fileSize) {
      //   const isLt = file.size / 1024 / 1024 < this.fileSize;
      //   if (!isLt) {
      //     this.$modal.msgError(`上传文件大小不能超过 ${this.fileSize} MB!`);
      //     return false;
      //   }
      // }
      this.$modal.loading("正在上传文件，请稍候...");
      this.number++;
      return true;
    },
    validExcelHeader(file) {
      const { projectType } = this;
      if (projectType == null) {
        this.$message.error("请选择项目类型后再上传清单");
        return false;
      }
      console.log(file);

      return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.onload = (e) => {
          const data = e.target.result;
          const workbook = XLSX.read(data, { type: "binary" });
          const firstSheetName = workbook.SheetNames[0];
          const worksheet = workbook.Sheets[firstSheetName];
          const json = XLSX.utils.sheet_to_json(worksheet, { header: 1 });
          const headers = json[0];

          console.log(headers);
          let expectJson = null;
          if (projectType === "0") {
            expectJson = {
              设备标识: "",
              所属组织: "",
              设备编码: "",
              是否重复摄像头: "",
              重复摄像头编码: "",
              重复类型: "",
              原始设备编码: "",
              设备名称: "",
              设备厂商: "",
              行政区域: "",
              监控点位类型: "",
              设备型号: "",
              点位俗称: "",
              IPV4地址: "",
              IPV6地址: "",
              网络类型: "",
              MAC地址: "",
              摄像机类型: "",
              摄像机功能类型: "",
              补光属性: "",
              摄像机编码格式: "",
              取电方式: "",
              是否有拾音器: "",
              摄像机分辨率: "",
              "所属街道/乡镇/社区": "",
              安装地址: "",
              纬度: "",
              经度: "",
              摄像机位置类型: "",
              监视方位: "",
              安装位置: "",
              联网属性: "",
              所属辖区公安机关: "",
              安装时间: "",
              架设高度: "",
              管理单位: "",
              管理单位联系方式: "",
              录像保存天数: "",
              录像保存位置: "",
              设备状态: "",
              运维单位: "",
              运维单位联系人: "",
              运维单位联系方式: "",
              关联设备: "",
              "所属部门/行业": "",
              所属项目: "",
              建设方式: "",
              摄像机扩展类型: "",
              杆件名称: "",
              杆件编码: "",
              杆件边界类型: "",
              布建场景: "",
              布建位置: "",
              设备类型: "",
              是否共享: "",
              共享范围: "",
              重点点位摄像机采集区域: "",
              设备账号密码: "",
              "现场联系人/联系方式": "",
              在离线: "",
            };
          } else if (projectType === "1") {
            expectJson = {
              序号: "",
              采购物品名称: "",
              品牌: "",
              型号: "",
              配置参数: "",
              单位: "",
              数量: "",
              "单价（元）": "",
              "金额（元）": "",
              备注: "",
            };
          }

          const expectedHeaders = Object.keys(expectJson);
          const flag =
            JSON.stringify(expectedHeaders) === JSON.stringify(headers);
          if (flag) {
            resolve();
          } else {
            this.$message.error("Excel文件表头内容不正确，请校验后再次上传");
            reject();
          }
        };

        reader.readAsBinaryString(file);
      });
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError(err) {
      this.$modal.msgError("上传文件失败，请重试");
      this.$modal.closeLoading();
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      if (res.code === 200) {
        this.uploadList.push({
          name: this.getFileName(res.data),
          url: this.baseUrl + "/file/download?name=" + res.data,
        });
        this.uploadedSuccessfully();
      } else {
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.fileUpload.handleRemove(file);
        this.uploadedSuccessfully();
      }
    },
    // 删除文件
    handleDelete(index) {
      this.fileList.splice(index, 1);
      this.$emit("input", this.listToString(this.fileList));
    },
    // 上传结束处理
    uploadedSuccessfully() {
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        this.$emit("input", this.listToString(this.fileList));
        console.log(this.listToString(this.fileList));
        this.$modal.closeLoading();
      }
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url.replace(this.baseUrl, "") + separator;
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
  },
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
.file-upload {
  width: 104px;
  height: 104px;
  background-color: #fbfdff;
  border: 1px dashed #c0ccda;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  .el-icon-plus {
    font-size: 28px;
    color: #8c939d;
  }
}
</style>
